Xilinx Virtex-6 Manual page 311

RAM32X2S
Primitive: 32-Deep by 2-Wide Static Synchronous RAM
Introduction
The design element is a 32-word by 2-bit static random access memory with synchronous write capability. When
the write enable (WE) is Low, transitions on the write clock (WCLK) are ignored and data stored in the RAM is
not affected. When (WE) is High, any positive transition on (WCLK) loads the data on the data input (D1-D0)
into the word selected by the 5-bit address (A4-A0). For predictable performance, address and data inputs must
be stable before a Low-to-High (WCLK) transition. This RAM block assumes an active-High (WCLK). However,
(WCLK) can be active-High or active-Low. Any inverter placed on the (WCLK) input net is absorbed into the
block. The signal output on the data output pins (O1-O0) is the data that is stored in the RAM at the location
defined by the values on the address pins.
You can use the INIT_00 and INIT_01 properties to specify the initial contents of RAM32X2S.
Logic Table
Inputs
WE (Mode)
0 (read)
1 (read)
1 (read)
1 (write)
1 (read)
Data = word addressed by bits A4:A0
Design Entry Method
Instantiation
Inference
CORE Generator™ and wizards
Macro support
Virtex-6 Libraries Guide for HDL Designs
UG623 (v 14.5) March 20, 2013
WCLK D
X X
0 X
1 X
↑
D1:D0
↓
X
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Chapter 4: About Design Elements
Outputs
O0-O1
Data
Data
Data
D1:D0
Data
Yes
Recommended
No
No
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